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Understanding Energy Efficiency Current NFRC Ratings

459928863When you are buying energy-efficient replacement windows, looking into NFRC ratings can help you decide which brand will offer you the level of energy-efficiency you want. The National Fenestration Ratings Council, or NFRC, is a non-profit organization that offers certified energy performance ratings to help you as a consumer find the right product for your needs. Keep reading to learn more about the ratings and what they mean.


This rating shows you how much heat transfer is available in a certain kind of window, which gives you an idea of how well it insulates. When it comes to U-Factor, the lower numbers indicate the best insulation opportunities. Insulation helps you maintain a comfortable temperature in your home without using as much energy.

Solar Heat Gain Coefficient (SHGC)

This rating helps you see how well a window can block out heat from the sun. The scale ranges from a 0 to a 1, with average values measuring at about 0.25 or 0.80. Once again, the lower numbers indicates windows that transmit less heat from the sun.

Visible Transmittance (VT)

The VT rating tells you how much natural light can travel through a window. The visible transmittance scale ranges from 0 to 1. The windows with the highest VT numbers allow in the most light.

Air Leakage (AL)

This number gives you an idea of how much air moves through window joints. The rating measures one cubic feet of air for every one square foot of window area per minute. The lower numbers represent windows that leak the least amount of air.

Condensation Resistance

This rating shows you how much the window can stand up to water build-up. The windows with the highest condensation resistance ratings let in the least amount of water build-up.

American Openings, Inc.specializes in selling energy-efficient replacement windows in Arizona. We manufacture and install replacement windows that will increase the energy efficiency of your entire home. To learn more about our products and installation services, visit us online or call (520) 664-1202.

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Contact American Openings during normal business hours at (520) 664-1202.


6885 E. Southpoint Road
Tucson, Arizona 85756
Phone: (520) 664-1202
Toll-Free: (800) 430-3385